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This CL connects the PIN entry view to the connection status view. It also adds a layer in the UI for connecting to the host, instead of going strait to the GLK view, we first end up on the new connection status view that will guide and inform the user about the state of their connection, prompting for PIN (or third party auth in time?). After a successful connection has been made the view is replaced with the HostViewController with the desktop rendering, etc.

Review-Url: https://codereview.chromium.org/2846603002
Cr-Commit-Position: refs/heads/master@{#468975}